1. Preheat the oven to 400°. Line a rimmed baking sheet with parchment paper. In a large bowl, combine the flour, baking powder, baking soda, salt and sugar. Add the cold butter pieces to the flour mixture, and roughly mix with a wooden spoon, making sure not to break up or soften the butter. Add the bacon, blue cheese and parsley, and toss until evenly mixed.2. Pour 1 cup buttermilk into the flour mixture, and gently stir with the wooden spoon. Stir in the remaining ½ cup buttermilk until the dough comes together. Do not overmix.3. With a large ice-cream scoop, spoon 10 heaping mounds of dough onto the prepared baking sheet, gently pressing down with the scoop while releasing the dough onto the baking sheet. Bake for 7 minutes. Turn the oven temperature down to 325°, and bake until the biscuitsare golden brown, about 18 additional minutes. Let cool on the pan for 5 minutes before serving.